Mine drilling machine



O='t.27,1925.` A

i I. S. MARSHALL MINE DRILLING IIAGHINE Filed Jan. 21.1925

Patented Oct. 27, 1925.

UNITED STATES IsAIAH s. MARSHALL,

or DES MOINES, IOWA.

MINE DEILLING MACHINE.

Application filed January To all whom t may concern;

Be it ltnown that I,- IsAiAH S. MAnsHALL,

a citizen of the United States, and `a resident of themechanism, parts being shown in sec-y of Des Moines, in the county of Polk and State of Iowa, have invented a certain new and useful Mine Drilling Machine, olf which the following is a specification.

The purpose o'f'my invention is to provide a mine drilling machine of simple construction, having certain advantages over the machines now in use. Y y

More particularly, it is my object to provide a machine having the parts s0 constructed andarranged that a horizontal hole can be drilled close to the top of the entry room,the operating' vcrank handle'lor Vother operating portion of the machine being arranged below the drill. l

With these and'other objects in view, my invention consists in the construction, arrangement and combination of the yvarious parts of my device, whereby the objects contemplated are attained, as hereinafter more fully set forth, pointed out in my claim, and illustrated in the accompanyingdrawings, in which: j A n I f Figure 1 shows aside elevation of a mine drilling machine embodying my invention. Figurer 2 shows a rear elevation of the same Y Figure 3 is a detailed, plan view of part Miners use a hand drill fdr drilling the holes for the explosive. This drill includes an upright frame, comprising 'two spaced' side members indicated in the accompanying drawings' by rthe reference numeral 1() con.-

nected at their upper and lower ends by caps l 11 and 12.

rFhe caps are provided with vertical journals 13 and 14. In the journal 14 of the lower cap 12 is slidably received a rod 15 designed to rest on the floor and be vertically adjustable in the journal. A set screw 16 is used for locking the rod 15 in the cap 12.

A rod 17 is screw-threaded and has a screw-threaded connection with the journal 13 and projects upwardly thereof. In the rod 17 is a handle 18 for rotating it.

It will be seen that the parts are adjusted approximately to correct position. Then the 21, 1925. Serial' No. 3,774.

frame isset up, as shown in Figure 1, with vthe rod 15 resting on the floor 19 and with the rod 17 adjacent to the roof 20.

The handle 18 is then manipulated for screwing the rod 17 out of the cap 11 until the rods 15 and 17 tightly engage the floor 19 and the roof 20.

Mounted between the sides 10 of the frame is a two-part bearing, indicated generally at A, comprising the lower member 21 and the upper member 22.

Thelower member 21 has laterally projecting ears 23 received between pairs of laterally projecting ears 24k on the upper bearing member 22.

Projecting laterally from the ears 23 are spindles 25 preferablyv provided with heads 26. In thevfor'ward edges of the frame members 10 are vertically spacedy notches27. j It will be understood that the notches 27 of thepi'espective side members 10 are arranged Yin .opposite l horizontally raligned Pallsi The spindles 25 are selectively inserted in any opposite pair of notches 27. This perj mits the adjustment of the bearing A to different heights with relation to the frame.

The bearing A is screw-threaded to receive as'crew-threadedrod 28, which has opposite longitudinalgrooves 29. j i

The drill bit 30 is fastened as at 31 tothe forward end ofthe threaded rod28. 'On the rod 28 adjacent to the rear side of the frame is a sprocket 32, having the hub 33, Vwhich is screw-threaded to coact with the rod 28 and which is provided with feathers or the like 34, as shown Vin Figure 2, projecting j into thegr'ooves29, so that when the sprooket 32 is rotated, its screwthreaded connection with the rod 28 will force the rod 28 lthat the lfeathers cause the rod 2 8 to rotate when the sprocket is rotated.

' The hub' 33 abuts against the bearing A. The parts just described do not in themselves alone form my present invention, since with the exception of the sprocket 32 they are old in this kind of aA machine.

In the ordinary machine, a beveled gear is mounted on the iod 28 and is arranged to cooperate with another suitably mounted beveled gear operated by a crank handle and arranged in mesh with the rst beveled gear.

The crank handle is so connected with the bearing A in the ordinary machine that when the bearing A is near the top of the frame l0, the crank handle is 'near the top of the frame 10.

In order to drill a hole near the top ofthe entry room with the ordinary machine, a hole must be made inclined so as 'to let the crank handle operate without striking the roof.

It is my purpose to `locate the operating handle substantially below the bearing vA, s that the drill may enter the face '35 for making a horizontal hole v40.

In order to accomplish this purpose, I

`provide a `shaft 4l having the reduced end portion 42.

@n the reduced'end portion is a. plate 43 (see Figure 4) adjacent to the shoulder 44 ofthe shaft 4l. l

On the shaft 4l adjacent tothe plate 43 is a sprocket having preferably asquared projecting hub on which the 'crank 47 may be placed. The cran 47 has a spacedV series of squared holes 48 to receive vthe hub portion 46.

rlhe reduced portion42 of the shaft 4l is extended between the frame members l() with `the lplate 43 resting against vthe rear edges of 'the frame members l0. A second plate 49 is `then placed-on the reduced shaft portion Yl2-adjacent to the vfront edges of the frame members l() and a suitable Wing nut or the like 50 is screwed'onto the forward screw-threaded end 5l of thereduced shaft portion 42 for locking lthe plates 43 and 49 to the frame members l0.

On the sprockets 32 and 45 is a sprocket chain 52.

It will be seen that the sprocket 45 mayV Ifthe drill is arranged horizontally, the hole can be drilled m such a Way as to miss the sulphur spots.

the use of my device, the hard drilling through the sulphur spots can be avoided..

Furthermore, it is very diliicult to drill through 'thesulphur spots at an angle, and this difficulty I avoid with my device.

It is very frequently the casethat the coal near the. roof is quite soft, Whereas it becomes harder farther down from theroof.'

Thus it follows that by being able to drill a horizontal hole near the roof, the drilling operation is much easier than Ais the lcase Where a slanting hole must be 'drilled partiallyl through the harder coal, gor'where, if a horizontal hole is drilled,wit `must be located farther down from the roof. Y

My device therefore reduces the labor of Adrilling `the vupper holes.

Changes vmay be ymade-in the vdetails of the construction of my device Ywithout departing Vfrom Athe real spirit and ,purpose of my vinvention, and it is my intention 12o-cover by my claim, any modified vforms of structure or use of mechanical equivalents which may be reasonably included within its scope.

I claim as my invention:

In a drill of the kind described, an upright frame, means for securing Athe lframe between a floor and a roof, a bearing structure mounted on the frame yfor vertical adju'stment thereon, a threaded rod mounted in said bearing in screw-threaded cooperation therewith,-a drill securedto saidrod, a

vscrew-threaded sprocket -mountedon said rod, said sprocket and lrod :having a nonrotatable sliding connection as Well zas the screw-threaded connection, a secondsprocket below the first sprocket in alignmenttherewith, a chain andsprocket means forV oper ating said second sprocket, and means for adj ustably v mounting the second-sprocket on the frame, said means comprising a shaft on which the second sprocket is mounted having jareduced end, plates on said'reduced end spaced from each other-for receiving'the framebetween them, andmeans for locking said plates on said frame.

Des Moines, Iowa, November, A1924.

I SAIAH S. `h/IARJSHALL.

T he sulphur spots are very vhard-and` difficult to -drill through, and so by 

